cy8c95x0_regmap_update_bits(9)

💅 cy8c95x0_regmap_update_bits — the kernel API manual, bestie edition

Okay so real quick: this page is cy8c95x0_regmap_update_bits(9) from the Kernel API Manual — it's a section 9 man page, so it's ✨kernel internals✨, not your regular ls-coreutils vibes. Stay with me, it's actually not that deep.

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✨ NAME ✨

cy8c95x0_regmap_update_bits — updates a register using the regmap cache 🎀

Like, that's the whole elevator pitch. It updates a register, and the regmap cache is along for the ride. Periodt.

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🌸 SYNOPSIS 🌸

int cy8c95x0_regmap_update_bits (struct cy8c95x0_pinctrl *chip ,
unsigned int reg , unsigned int port , unsigned int mask , unsigned int
val );

That's five whole arguments, she's a demanding function, but we respect her. 💅

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🦋 ARGUMENTS 🦋

• chip — the pinctrl we're working on. Your main character struct, fr fr.
• reg — the register to write to. Can be either a direct access register or a muxed register. MUST NOT be the PORTSEL register 🚨 — like, do not do that, that's not the vibe.
• port — the port to use for muxed registers, or for quick path direct access registers. Otherwise it just sits there unused, lowkey minding its own business.
• mask — the bitmask to change. Show it which bits you care about 💖
• val — the new value for that bitmask. The glow-up itself ✨

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💜 DESCRIPTION 💜

So this function handles the register updates for both the direct access registers and the muxed registers — and the whole time it's caching all register accesses 🧚. Internally it handles the correct state of the PORTSEL register and protects the access to muxed registers. Iconic behaviour, no notes.

⚠️ Warning bestie: the caller must only use this function to change registers behind the PORTSEL mux. Like, that's the rule. Respect it. 🙈

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🔥 RETURN 🔥

• 0 — for a successful request 🎉 (slay)
• otherwise — a corresponding error value 😭 (it's giving "something went wrong", go check)

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/pinctrl/pinctrl-cy8c95x0.c
• struct cy8c95x0_pinctrl(9)
• cy8c95x0_regmap_write_bits(9)
• cy8c95x0_regmap_read_bits(9)

iykyk — go read those next, they're the friend group 👑

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And that's the whole page, bestie! This lil masterpiece lives in ./drivers/pinctrl and it's dated October 2026 — yes, October 2026, she's from the future, main character energy only 👑🫶💖